Door-lock.



J. KUSKE. nooR 1.00K.A APPLIOATION FILED DEC. 12,v 1912.

1,066,021. A Pater-.tea July 1, 1913.

l f4 16 20 9 4d .mm I, 6 f

IIHH T3 l 2 1715 16" lfj UNTED STATES VPATENT OFFICE.

JOSEPH KUSKE, OF ASTORIA, NEW YORK.

:DOOR-LOCK.

To all whom z'i may concern Be it known that I, JOSEPH KUsKE, a citizenof the United States, residing at Astoria, in the borough of Queens, inthe county of Queens and State of New York, have invented certain newand useful linprovements in Door-Locks, of which the following is aspecification, reference being had therein to the accompanying drawings,forming part thereof.

My invention relates to door locks and has for its objects a combinedlock and latch which is extremely compact, simple in construction,inexpensive of manufacture, durable and unlikely to get out of order.

Other objects and advantages of my invention will hereinafter appear.

My invention includes improvements in both t-lie latcliing and thelocking mechanism affecting their coperative` correlation. Theseimprovements relate to the carrying out of the above mentioned objectsof the invention and more particularly, for example, to econoinizingspace within the lock casing to the greatest advant-age while at thesame time providing ample key space and to the production of a devicewhich is highly effective as a whole and in all its parts.

My invention also includes several features of construction andcombinations of parts, as will appear from the following description. j

I shall now describe the lock illustrated in the accompanying drawingsembodying my invention in claims.

Figure l is a front elevation of the lock with the front plate renioved.Fig'.` Q; is a similar view with the casing partly ini longitudinalsection and with the locking mechanism in the locking position. Fig. 3is a longitudinal section on a plane indicated by the line 3 3 of Fig. 2as viewed from below.` Fig. 4 is a transverse section on a pla-neindicated by the line 4 4 of Fig. 2 as viewed from the left. Fig.k 5 isa front elevation of the tumbler,l for holding the locking bolt. Fig. 6is a similar'view of the locking bolt. Fig. 7 is a reduced sideelevation of the key for the lock.

The lock embodying my invention illustratedin the drawings has anelongated transversely rectangular casingprovided with a removable frontplate 2 and a face Specification ofLetters Patent.

Application filed December 12, 1912.

Patented July 1 1913. Serial No. 736,275.

serted in an auger hole bored in theV edge of a door, and for housedoors a convenient size for the casing, and one which also providesadequate strength in the workin@ parts of the lock, is such as willenable the casing to be snugly received into an auger hole of one-inchdiameter, the cylindrical hole for the casing corresponding in diameterto the central circular portion of the face plate 2 (Fig. 4), othersmaller shallow holes of a depth equal to the thickness of the faceplate being bored in the door for the circular ends of the face plate.

Internally the casing is provided with a guide for a latch bolt and fora lock bolt, such guide being shown as a flattened, bifurcated post 4arranged transversely of the casing and projecting forwardly from theback plate of the casing. A latch bolt 5 has an enlarged head guided iiithe face plate, a cylindrical shank guided in the fork of the bifurcatedguide post and a crosspiece forming a T at the rea-r end of the shankand adapted to abut against the guide post 4 to limittlie outwardmovement of the bolt. A coiled compression spring 6 surrounds the shankof the latch bolt and acts ibetween the post 4 and the head of the llatch bolt to project the latter.

tion. described. my invention and` shall thereafter point out Manuallyoperable mechanism is provided for retracting the latch bolt andkey-actuated locking mechanism is provided for locking the latch bolt inthe projected posi- The latter mechanism will be first A transverselysliding lock bolt 7 (Fig.

has guide surfaces guided by the guide fpost 4 and is shown as providedwith a guide-slot fitting' over the fiattened post 4 just back ofthehead and of the latch bolt 5 between the latch bolt and the back wall`of the casing. rlhe lock bolt 7 is adapted 5to slide on the guide post4 transversely across the casing from the unlocked position, shown inFig. l, to the locking position, sh wii` in Figs. 2 and 3, and viceversa.

i The lock bolt 7 is provided with a forwardly projecting stud adapted,in the locking posiltion of the lock bolt, to occupy a posit-ion 'plate3. The casing is adapted to be inat the rear of and in the path of thecrosspiece carried by the latch bolt 5 (Figs. 2

and 3) and, in the unlocked position of the latch bolt to occupy aposition adjacent to the side wall of the casing and out of the path ofthe rear end of the latch bolt (Fig.

The rear edge of the lock bolt 7 is provided with a key-receiving notchhaving` shoulders adapted to be engaged by the full length centralportion of the bit or wing of the key (Fig. 7) to niovc the lock bolt 7in either direction. At.- a suitable distance rearward of the lock bolt7 the casing is provided with a through key-hole 8. A bolt-holdingtumbler 9 (Fig. 5) is provided and is shown as a flat apertured plateloosely surrounding the base portion of the guide post Ll between thelocking bolt 7 and the back wall of the casing and pivoted on a shortstud 10 projecting from such casing wall. The tumbler 9 is provided witha forwardly projecting lug which in the locked position of the partsenters a notch formed for the purpose in the forward edge of the lockbolt 7 (Figs. 2 and 3) and which in the unlocked position of the partsengages the adjacent end of the lock bolt (F ig. 1), in either casepreventing the movement of the lock bolt, holding it at either thelocked or at the unlocked position. bler 9 is adapted to be actuated byeither of the reduced portions of the bit of the key, according towhether the key is inserted from the front or the back. The tumbler 9 ispressed to-ward its bolt-engaging position by a bent spring 11 anchoredto a small, fiat, substantially triangular block 12 loosely fitting intothe adjacent corner of the casing and held in place by a pin 13 carriedby the front plate 2 of the casing and pressing with its free end on theanchor block 12.

The manually operable mechanism for retracting the latch bolt 5, when itis not locked by the lock bolt 7, will now be described,

A roll-back 14, having through it axially a square hole adapting it tobe operated by means of a usual knob spindle and knobs, is jo-urnalcd inthe rear end of the casing by means of shouldered reduced cylindricalends passing through the front and back walls of the casing. A lever 15of the third order is pivoted at one end on a pivot stud 16 projectingfrom the back wall of the casing and extends transversely substantiallyacross the casing, terminating in a tapered and rearwardly curved freeend adjacent to the casing wall, which is shown as slotted for the freemovement of the lever (Fig. 2). A short link 17 is provided with rigidpivot studs one of which enters a pivot hole at a middle point of thelever 15 and the other of which enters a pivot hole in a lug projectingfrom the side of the roll-back 14. A pull-back strap or connecting bar18 is slidable along a side wall of the'casing and has at its rear end alug projecting` toward the back of the casing and having a conveXlycurved sloping face engaged by the correspondingly inclined concavelycurved free end of the lever 15, So that the lever will exert a slightbut sufficient pressure to keep this end of the pull-back strap incontact with the wall of the casing. At its forward end the pull-backstrap has a, toe which projects at the front of the cross-piece formingthe 'l' at the rear end of the latch bolt 5, the adjacent end of thiscrosspiece keeping this end of the pull-back strap 18 close to theadjacent wall of thecasing. By reason of the constructive arrangementjust described, ample key space is provided in the casing between thepull-back strap 18 in the opposite side wall of the casing, and likewisebetween the lever 15 Vand the locking mechanism, including the lock bolt7 and its tumbler 9, thereby permitting the casing to be of minimumdimensions, particularly transversely. A bent leaf spring 19 engages thewalls of casing and has a free end engaging at the rear of a pin on thepull-back strap 18 near the rear end thereof and acts to restore thepull-back strap and its actuating parts, including the lever 15, thelink 17 and the roll-back 14, to the bolt-retractive position shown inthe drawings. The bolt-projecting spring 6 could be strong enough alsoeffectively to return the bolt-retracting mechanism, but the separatespring 19 for this purpose is of distinct value in that thereby theboltprojecting' spring 6 may be much more yieldablc or less stiff,permitting the door to close easily and also obviating wear on the latchbolt and its guides and on the usual. keeper. The front plate 2 of thecasing is held in place by a single central screw entering a centrallylocated internally screw-threaded anchor post 20 on the back plate ofthe casing. The front plate 2 carries a short stud 21, for holding downthe pull-back strap 18.

The operation of the above described lock embodying my invention hasbeen described in connection with the description of the construction.lt should be noted, however, that the objects of my invention, stated atthe beginning of this specification, have been effectively attained.

It is obvious that various modifications of the construction shown inthe drawings and above particularly described may be made within theprinciple and scope of my invention.

I claim:

1. A door lock comprising, in combination, an elongated casing providedwith a flattened bifurcated guide arranged transversely of the casing, aspring-proj ected latch bolt arranged longitudinally of the casinghaving an enlarged head and having ashank guided in the fork of thebifurcated guide, a transversely sliding key-actuated lock bolt providedwith guiding surfaces guided by the guide and having a portion movableVinto and out of the path of the rear end of iso the latch bolt to lockor to release the latch bolt, a lever arranged transversely of thecasing and fulcrumed thereto, a roll-back journaled in the casing,connections between the roll-back and the lever for actuating` thelatter from the former, and a pull-back strap engaged by the lever andengaging the latch bolt to retract the latch bolt and to permitindependent inward movement of the latch bolt, the pull-back strapsliding along a side wall of the casing so as to provide key spacewithin the casing inwardly from the pull-back strap between the leverand the lock bolt.

2. A door lock comprising, in combination, an elongated casing providedwith a flattened bifurcated guide post arranged transversely of thecasing, a spring-projected latch bolt longitudinally of the casinghaving an enlarged head and having a shank guided in the fork of thebifurcated guide post, a transversely sliding lock bolt provided with aguide-slot and guided by the guide post and having a portion adapted tomove into and out of the path of the latch bolt at the rear thereof,thereby to lock or t-o release the latch bolt, and means for manuallyretracting the latch bolt when itis not locked by the lock bolt.

3. A door lock comprising, in combination, an elongated casing providedwith a flattened bifurcated guide arranged transversely of the casing, alatch bolt having a shank and an enlarged head and a crosspiece forminga T at the rear end of the shank, the shank being guided in the fork ofthe bifurcated guide and the cross-piece being adapted to engage theguide to limit the outward movement of the bolt, a spring acting betweenthe head of the latch bolt and the guide to project the latch bolt, atransversely sliding key-actuated lock bolt having guide surfaces guidedby the guide and having a projection adapted to travel into and out ofthe path of the rear end of the latch bolt, a roll-back journaled in thecasing, a lever fulcrumed to the casing and arranged transverselythereof. an operating connection between the roll-back and the lever foractuating the latter from the former, a pull-back strap slidable alongaside wall of the casing and adapted to be engaged by the lever andhaving a toe engaging the forward side of the cross-piece of the latchbolt to retract the latch bolt and to permit independent inward movementof the same, and a spring engaging the pull-back strap to return thepull-back strapA and its actuating parts to the boltretractive position.

4. A door lock comprising, in combination, an elongated casing providedwith a flattened bifurcated guide arranged transversely of the casing, aspring-projected latch bolt longitudinally of the casing having anenlarged head and having a shank guided in the fork of the bifurcatedguide, a transversely sliding key-actuated lock bolt provided withguiding surfaces guided by the guide and having a projection adapted tomove into and out of the path of the rear end of the latch bolt, aroll-back journaled in the casing, a lever of the third order fulcrumedat one end to the casing and extending transversely thereof, a linkpivotally connecting the roll-back to the lever at a point eccentric ofthe former and medial of the latter, and a pull-back strap adapted toengage the latch bolt to retract the same and to be engaged by the freeend of the lever and lying alongside ther adjacent wall of the casing soas to provide free key space within the casing inwardly from such strap.

5. A door lock comprising, in combination, an elongated casing providedwith a flattened bifurcated guide disposed transversely of the casing, alatch bolt having a shank and an enlarged head and a crosspiece forminga T at the rear end of the shank, the shank being guided in the fork ofthe bifurcated guide and the cross-piece being adapted to engage theguide to limit the outward movement of the bolt, a spring acting betweenthe head of the catch bolt and the guide to project the latch bolt, atransversely sliding key-actuated lock bolt between the rear portion ofthe latch bolt and the wall of the casing and having guide surfacesguided by the guide and having a projecting stud adapted to travel intoor out of the path of the rear end of the latch bolt, a spring-pressedkey-actuated tumbler plate pivoted to the casing between the lock boltand casing wall and coperative with the lock bolt to hold the same, aroll-back journaled in the casing, a lever of the third order fulcrumedat one end to the casing and extending transversely thereof, a pivotedlink connecting the roll-back to the lever eccentrically of the formerand medially of the latter, a pull-back strap slidable along theadjacent side wall of the casing and adapted to be engaged by the freeend of the lever and having a toe engaging the forward side of thecross-piece of the latch bolt to retract the latch bolt and to permitindependent inward movement of the same, and a spring engaging thepull-back strap to return the pull-back strap and its actuating parts tothe bolt-retractive nes-ities..

In testimony whereof I have aiiiXed my signature in presence of twowitnesses.

JOSEPH KUSKE. 1Witnesses VTM. A. KELLY, Vio'ron D. Bons'r.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

